RFR: JDK-8295865: Several issues with os::realloc [v2]

[David Holmes]

On Mon, 31 Oct 2022 09:40:43 GMT, David Holmes <dholmes at openjdk.org> wrote:

>> Thomas Stuefe has updated the pull request incrementally with two additional commits since the last revision:
>> 
>>  - add clarifying comment about ASSERT/EXPECT helpers
>>  - if realloc(3) fails, revive the old header and re-account its size with NMT
>
> This all appears to be quite reasonable.
> 
> I have a couple of queries.
> 
> Thanks.

> @dholmes-ora what do you think? Should I revert to the earlier, simpler version?

Sorry @tstuefe I don't know enough about NMT to evaluate the two versions.

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PR: https://git.openjdk.org/jdk/pull/10857